Transactions
| Date | Player | Pos | Transactions |
| 4/26 | Zach Redmond | D | Signed with European team EHC Red Bull Munchen-Germany |
| 3/25 | Mattias Samuelsson | D | Signed Three-year, entry-level contract |
| 3/23 | Dawson DiPietro | LW | Signed as Free Agent One-year, entry-level contract |
| 3/18 | Brandon Biro | LW | Signed as Free Agent Two-year, entry-level contract |
| 3/8 | John Gilmour | D | Sent to minors Rochester-AHL |
| 3/7 | John Gilmour | D | Called up from minors from Rochester-AHL |
| 3/6 | Jonas Johansson | G | Sent to minors Rochester-AHL |
| 2/27 | Lawrence Pilut | D | Called up from minors from Rochester-AHL |
| 2/27 | John Gilmour | D | Sent to minors Rochester-AHL |
| 2/26 | John Gilmour | D | Called up from minors from Rochester-AHL |
| 2/24 | Jonas Johansson | G | Called up from minors from Rochester-AHL |
| 2/24 | John Gilmour | D | Sent to minors Rochester-AHL |
| 2/24 | Jonas Johansson | G | Sent to minors Rochester-AHL |
| 2/24 | Wayne Simmonds | RW | Traded for cond '21 pick |
| 2/24 | Dominik Kahun | LW | Traded for Sheary, Rodrigues |
| 2/21 | Scott Wilson | LW | Sent to minors Rochester-AHL |
| 2/21 | Zach Bogosian | D | Waived For purpose of being released |
| 2/17 | Scott Wilson | LW | Called up from minors from Rochester-AHL |
| 2/17 | Andrew Hammond | G | Sent to minors Rochester-AHL |
| 2/17 | Taylor Leier | LW | Signed as Free Agent One-year, two-way contract |
| 2/17 | Zach Bogosian | D | Suspended Indefinitely by team for not reporting |
| 2/17 | Taylor Leier | LW | Waived |
| 2/15 | John Gilmour | D | Called up from minors from Rochester-AHL |
| 2/15 | Andrew Hammond | G | Called up from minors from Rochester-AHL |
| 2/15 | Zach Bogosian | D | Sent to minors Rochester-AHL |
| 2/14 | Lawrence Pilut | D | Sent to minors Rochester-AHL |
| 2/14 | Zach Bogosian | D | Waived |
| 2/13 | Scott Wilson | LW | Sent to minors Rochester-AHL |
| 2/10 | Andrew Hammond | G | Sent to minors Rochester-AHL |
| 2/9 | Lawrence Pilut | D | Called up from minors from Rochester-AHL |
| 2/9 | Andrew Hammond | G | Called up from minors from Rochester-AHL |
| 2/8 | Lawrence Pilut | D | Sent to minors Rochester-AHL |
| 2/8 | Rasmus Asplund | RW | Sent to minors Rochester-AHL |
| 2/5 | Scott Wilson | LW | Called up from minors from Rochester-AHL |
| 2/5 | Jean-Sebastien Dea | C | Sent to minors Rochester-AHL |
| 2/4 | Rasmus Asplund | RW | Called up from minors from Rochester-AHL |
| 1/31 | Jean-Sebastien Dea | C | Called up from minors from Rochester-AHL |
| 1/30 | Kyle Okposo | RW | Placed on IR Upper-body injury - left game |
| 1/29 | Jonas Johansson | G | Called up from minors from Rochester-AHL |
| 1/26 | Lawrence Pilut | D | Called up from minors from Rochester-AHL |
| 1/19 | Lawrence Pilut | D | Sent to minors Rochester-AHL |
| 1/19 | Scott Wilson | LW | Sent to minors Rochester-AHL |
| 1/19 | Rasmus Asplund | RW | Sent to minors Rochester-AHL |
| 1/7 | Lawrence Pilut | D | Called up from minors from Rochester-AHL |
| 1/6 | Dalton Smith | LW | Sent to minors Rochester-AHL |
| 1/3 | Scott Wilson | LW | Called up from minors from Rochester-AHL |
| 1/3 | Michael Frolik | RW | Traded for 2020 4th-rd pick |
| 1/2 | Dalton Smith | LW | Waived |
| 1/2 | Victor Olofsson | LW | Placed on IR Lower-body injury - left game |
| 12/30 | Dalton Smith | LW | Signed as Free Agent One-year, two-way contract |
| 12/27 | Curtis Lazar | RW | Called up from minors from Rochester-AHL |
| 12/27 | Jeff Skinner | LW | Placed on IR Upper-body injury - left game |
| 12/23 | Curtis Lazar | RW | Sent to minors Rochester-AHL |
| 12/20 | Curtis Lazar | RW | Called up from minors from Rochester-AHL |
| 12/15 | Casey Mittelstadt | C | Sent to minors Rochester-AHL |
| 12/4 | Jean-Sebastien Dea | C | Sent to minors Rochester-AHL |
| 12/3 | Curtis Lazar | RW | Sent to minors Rochester-AHL |
| 11/25 | Jean-Sebastien Dea | C | Called up from minors from Rochester-AHL |
| 11/25 | Rasmus Dahlin | D | Placed on IR Concussion - left game |
| 11/24 | Matt Spencer | D | Traded for Devante Stephens |
| 11/23 | John Gilmour | D | Sent to minors Rochester-AHL |
| 11/22 | John Gilmour | D | Waived |
| 11/20 | Brady Vail | C | Signed as Free Agent Minors contract - Rochester-AHL |
| 11/17 | Tage Thompson | RW | Called up from minors from Rochester-AHL |
| 11/17 | Tage Thompson | RW | Placed on IR Shoulder - left game |
| 11/16 | Kyle Okposo | RW | Placed on IR Concussion - left game |
| 11/15 | Rasmus Asplund | C | Called up from minors from Rochester-AHL |
| 11/13 | Curtis Lazar | C | Called up from minors from Rochester-AHL |
| 11/13 | Marcus Johansson | C | Placed on IR Upper-body injury |
| 11/11 | Lawrence Pilut | D | Sent to minors Rochester-AHL |
| 11/9 | Andrew Hammond | G | Sent to minors Rochester-AHL |
| 11/8 | Vladimir Sobotka | RW | Placed on IR Knee - left game |
| 11/3 | Lawrence Pilut | D | Called up from minors from Rochester-AHL |
| 11/3 | Andrew Hammond | G | Called up from minors from Rochester-AHL |
| 10/29 | William Borgen | D | Sent to minors Rochester-AHL |
| 10/27 | William Borgen | D | Called up from minors from Rochester-AHL |
| 10/26 | William Borgen | D | Sent to minors Rochester-AHL |
| 10/25 | William Borgen | D | Called up from minors from Rochester-AHL |
| 10/24 | Marco Scandella | D | Placed on IR Lower-body injury - left game |
| 10/20 | Ukko-Pekka Luukkonen | G | Sent to minors Rochester-AHL |
| 10/18 | Curtis Lazar | C | Sent to minors Rochester-AHL |
| 10/13 | Curtis Lazar | C | Called up from minors from Rochester-AHL |
| 10/3 | Henri Jokiharju | D | Called up from minors from Rochester-AHL |
| 10/3 | Victor Olofsson | LW | Called up from minors from Rochester-AHL |
| 10/3 | Jean-Sebastien Dea | C | Sent to minors Rochester-AHL |
| 10/3 | Curtis Lazar | C | Sent to minors Rochester-AHL |
| 10/3 | Lawrence Pilut | D | Sent to minors Rochester-AHL |
| 10/3 | Brett Murray | LW | Signed as Free Agent Minors contract - Rochester-AHL |
| 10/1 | Curtis Lazar | C | Called up from minors from Rochester-AHL |
| 10/1 | Jean-Sebastien Dea | C | Called up from minors from Rochester-AHL |
| 10/1 | Lawrence Pilut | D | Called up from minors from Rochester-AHL |
| 10/1 | Scott Wilson | LW | Sent to minors Rochester-AHL |
| 10/1 | Casey Nelson | D | Sent to minors Rochester-AHL |
| 10/1 | Remi Elie | LW | Sent to minors Rochester-AHL |
| 10/1 | Henri Jokiharju | D | Sent to minors Rochester-AHL |
| 10/1 | Victor Olofsson | LW | Sent to minors Rochester-AHL |
| 10/1 | Curtis Lazar | C | Sent to minors Rochester-AHL |
| 9/30 | Rasmus Asplund | C | Sent to minors Rochester-AHL |
| 9/30 | Tage Thompson | RW | Sent to minors Rochester-AHL |
| 9/30 | Lawrence Pilut | D | Sent to minors Rochester-AHL |
| 9/30 | Scott Wilson | LW | Waived |
| 9/30 | Remi Elie | LW | Waived |
| 9/30 | Curtis Lazar | C | Waived |
| 9/30 | Casey Nelson | D | Waived |
| 9/29 | William Borgen | D | Sent to minors Rochester-AHL |
| 9/26 | Dylan Cozens | C | Assigned to Junior Club Lethbridge-WHL |
| 9/24 | Jean-Sebastien Dea | C | Sent to minors Rochester-AHL |
| 9/23 | Andrew Hammond | G | Sent to minors Rochester-AHL |
| 9/23 | C.J. Smith | LW | Sent to minors Rochester-AHL |
| 9/23 | Jean-Sebastien Dea | C | Waived |
| 9/22 | Arttu Ruotsalainen | C | Assigned to European Team Tampere-Finland |
| 9/22 | Sean Malone | C | Sent to minors Rochester-AHL |
| 9/22 | Andrew Oglevie | C | Sent to minors Rochester-AHL |
| 9/22 | Kyle Olson | RW | Sent to minors Rochester-AHL |
| 9/22 | Kevin Porter | C | Sent to minors Rochester-AHL |
| 9/22 | Jonas Johansson | G | Sent to minors Rochester-AHL |
| 9/22 | Eric Cornel | C | Sent to minors Rochester-AHL |
| 9/22 | Michael Houser | G | Sent to minors Rochester-AHL |
| 9/22 | Jacob Bryson | D | Sent to minors Rochester-AHL |
| 9/22 | Casey Fitzgerald | D | Sent to minors Rochester-AHL |
| 9/22 | Brandon Hickey | D | Sent to minors Rochester-AHL |
| 9/22 | Zach Redmond | D | Sent to minors Rochester-AHL |
| 9/22 | Devante Stephens | D | Sent to minors Rochester-AHL |
| 9/22 | Andrew Hammond | G | Waived |
| 9/22 | C.J. Smith | LW | Waived |
| 9/18 | Matej Pekar | C | Assigned to Junior Club Barrie-OHL |
| 9/13 | Matt Hunwick | D | Placed on IR Neck |
| 9/13 | Ukko-Pekka Luukkonen | G | Placed on IR Hip |
| 9/11 | Eric Cornel | C | Invited to Training Camp |
| 9/11 | Sean Malone | C | Invited to Training Camp |
| 9/11 | Michael Houser | G | Invited to Training Camp |
| 9/11 | Kevin Porter | C | Invited to Training Camp |
| 9/11 | Zach Redmond | D | Invited to Training Camp |
| 9/11 | Kyle Olson | RW | Invited to Training Camp |
| 8/29 | Michael Houser | G | Signed as Free Agent Minors contract - Rochester-AHL |
| 8/29 | Mason Mitchell | LW | Signed as Free Agent Minors contract - Rochester-AHL |
| 8/3 | Jake McCabe | D | Re-Signed Two-year contract |
| 8/3 | Linus Ullmark | G | Re-Signed One-year contract |
| 8/1 | Remi Elie | LW | Re-Signed One-year, two-way contract |
| 7/25 | Evan Rodrigues | C | Re-Signed One-year contract |
| 7/24 | Frank Hora | D | Signed as Free Agent Minors contract - Rochester-AHL |
| 7/24 | Shaw Boomhower | LW | Signed as Free Agent Minors contract - Rochester-AHL |
| 7/15 | Dylan Cozens | C | Signed Three-year, entry-level contract |
| 7/12 | Johan Larsson | C | Re-Signed One-year contract |
| 7/9 | Henri Jokiharju | D | Traded for Alexander Nylander |
| 7/8 | Tyler Randell | RW | Signed as Free Agent Minors contract - Rochester-AHL |
| 7/6 | Nathan Paetsch | D | Signed as Free Agent Minors contract - Rochester-AHL |
| 7/6 | Marcus Johansson | LW | Signed as Free Agent Two-year contract |
| 7/5 | Zemgus Girgensons | LW | Re-Signed One-year contract |
| 7/5 | Jarrett Burton | C | Signed as Free Agent Minors contract - Rochester-AHL |
| 7/5 | Eric Cornel | C | Signed as Free Agent Minors contract - Rochester-AHL |
| 7/2 | C.J. Smith | LW | Re-Signed Two-year contract |
| 7/1 | Kyle Criscuolo | C | Became Unrestricted Free Agent |
| 7/1 | Sean Malone | C | Became Unrestricted Free Agent Not tendered a qualifying offer |
| 7/1 | Jack Dougherty | D | Became Unrestricted Free Agent Not tendered a qualifying offer |
| 7/1 | Eric Cornel | C | Became Unrestricted Free Agent Not tendered a qualifying offer |
| 7/1 | Adam Wilcox | G | Became Unrestricted Free Agent |
| 7/1 | Brycen Martin | D | Became Unrestricted Free Agent Not tendered a qualifying offer |
| 7/1 | Matt Moulson | LW | Became Unrestricted Free Agent |
| 7/1 | Jason Pominville | RW | Became Unrestricted Free Agent |
| 7/1 | Kevin Porter | C | Became Unrestricted Free Agent |
| 7/1 | Matt Tennyson | D | Became Unrestricted Free Agent |
| 7/1 | Taylor Leier | LW | Became Unrestricted Free Agent |
| 7/1 | Danny O'Regan | C | Became Unrestricted Free Agent |
| 7/1 | Scott Wedgewood | G | Became Unrestricted Free Agent |
| 7/1 | Andrew Hammond | G | Signed as Free Agent One-year contract |
| 7/1 | John Gilmour | D | Signed as Free Agent One-year contract |
| 7/1 | Curtis Lazar | C | Signed as Free Agent One-year contract |
| 7/1 | Jean-Sebastien Dea | C | Signed as Free Agent Two-year contract |
| 7/1 | Jimmy Vesey | RW | Traded for 2021 3rd-rd pick |
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